Method retrieve_source

src/liboslcomp/oslcomp.cpp:1037–1061

std::string
OSLCompilerImpl::retrieve_source (ustring filename, int line)
{
    // If we don't already have the file open, open it
    if (filename != m_last_sourcefile) {
        bool ok = OIIO::Filesystem::read_text_file (filename, m_filecontents);
        if (ok) {
            m_last_sourcefile = filename;
        } else {
            m_last_sourcefile = ustring();
            return "<file not found>";
        }
    }

    // Now read lines up to and including the file we want.
    OIIO::string_view s (m_filecontents);
    for ( ; line > 1; --line) {
        size_t p = s.find_first_of ('\n');
        if (p == OIIO::string_view::npos)
            return "<line not found>";
        s.remove_prefix (p+1);
    }
    s = s.substr (0, s.find_first_of ('\n'));
    return s;
}